QObject::connect - error: no matching function for call to ... ^

[Ibrahim]

Hi;
My Codes:
mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QMap>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
  Q_OBJECT

public:
  explicit MainWindow(QWidget *parent = 0);
  ~MainWindow();

private:
  Ui::MainWindow *ui;
  QMap<QString, QString> changes;
};

#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
  QMainWindow(parent),
  ui(new Ui::MainWindow)
{
  ui->setupUi(this);

  connect(ui->lineEdit, SIGNAL(textChanged(QString)), [this](const QString& value) { changes["lineEdit"] = value; }); // I get error here.
}

MainWindow::~MainWindow()
{
  delete ui;
}

I get this error message:

/home/UserName/My Projects/project1/mainwindow.cpp:12: error: no matching function for call to 'MainWindow::connect(QLineEdit*&, const char*, MainWindow::MainWindow(QWidget*)::<lambda(const QString&)>)'
   connect(ui->lineEdit, SIGNAL(textChanged(QString)), [this](const QString& value) { changes["lineEdit"] = value; });
                                                                                                                    ^

Error Message: Image Link
Thanks.

[VRonin]

You are mixing two connect syntaxes, you cannot use the old SIGNAL() way with lambdas.
connect(ui->lineEdit, SIGNAL(textChanged(QString)), [this](const QString& value) { changes["lineEdit"] = value; });
should become
connect(ui->lineEdit, &QLineEdit::textChanged, [this](const QString& value) { changes["lineEdit"] = value; });

[Ibrahim]

@VRonin Thanks. It is work.